AMP head rated 600W @ 4 ohms 900W @ 2 ohms. switch to engage 2 ohm load have a 2x10 cab rated 400W @ 4 ohms and a 1 x 15 rated 400W @ 8 ohms If I paid attention in math class - using both cabs will be 2.66 ohms & 800W So I assume the 2.66 ohm with AMP set to 2 ohm will not damage the AMP. The ".66" ohms will prevent the AMP from putting out the full 900W, so drivers should be save. Is this sound math? will the 2.66 load and 2 Ohm setting cause any weird distorted tones?